I don’t think choosing to drop an argument because you feel the other person won’t change their mind is silly, to be clear. I think using a forum avatar to interpret that is. It can be gleaned pretty well from what someone is saying, what they play is more or less irrelevant.
For example, I think Dreadmoore is incredibly biased towards Death Knights. But that’s from his numerous comments about them and (incorrectly) about the Lich King. He’d often post on an Orc Warrior for a long time. A trend of assumption that I think does more harm then good.